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Since the beginning of 1977, the network transistor "Concert-304" has produced the Moscow Experimental Plant "Agregat". The microphone is assembled on transistors, and since 1990 on a chip and a transistor in a desktop version, with power from the network. Designed to play recordings from ordinary and long-playing records on your own detachable speaker system. The model has II-EPU-50, which has three speeds of disk rotation and auto-stop after the end of playing the record. The speaker has two speakers 1GD-40. The operating frequency range of the sound reproduced by speakers is 100 ... 10,000 Hz. Rated output power 1.5, maximum 3 watts. Bass amplifier is assembled on nine transistors (microcircuit and transistor). Power consumption from a network of 20 watts. Dimensions of the model with speakers - 410x275x185 mm. Weight 7.5 kg.